Driving and stopping mechanism



July 7, 1925. 1,545,116

F. ASHVVORTH DRIVING AND STOPPING MECHANISM Original Filed May l9 l92O 4Sheets-Sheet 1 li ymz,

July 7, 1925. 1,545,116

F. ASHWORTH DRIVING AND STOPPING MECHANISM 4 Sheets-Sheet 2 OriinalFiled May 19, 1920 MW M 2456/22 MVWLW' KL M gym 4 July 7, 1925.

F. ASHWORTH DRIVING AND STOPPING MECHANISM 4 Sheets-Sheet Original FiledMay 19, 1920 July 7, 1925.

F. ASHWQRTH DRIVING AND STOPPING MECHANISM Original Filed 19, 1920 4Sheets-Sheet 4 v P 7/ f, L

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v I $44K Patented July 7, 1925.

UNITED STATES FRED ASHWORTH, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TOUNITED SHOE MA- PATEP ZT @FFKCE.

CHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEWJERSEY.

DRIVING AND STOPPING MECHANISM.

Original application filed May 19, 1920, Serial No. 382,558. Divided andthis application filed June 8, 1920. Serial No. 387,346.

To aZZwhom it may concern Be it known that I, FRED AsHwon'rH, a citizenof the United States, residing at Beverly, in the county of Essex andState of Massachusetts, have invented certain new and usefulImprovements in Driving and Stopping Mechanism; and Ido hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to driving and stopping mechanisms andmore particularly to driving and stopping mechanisms for shoe sewing andother high speed machines.

The object of the present invention is to provide a novel and improveddriving and stopping mechanism of this type which is simple and compactin construction, and eflicient in operation, and which is designed tostop the machine without undue shock or wear on its parts.

Vith this object in view the features of the present invention consistin certain constructions, arrangements, and combinations of partshereinafter described and claimed, the advantages of which will beobvious to those skilled in the art.

The several features of the present invention will be clearly understoodfrom the following description and accompanying draw ings in whichFigure 1 is a side elevation of a portion of a shoe sewing machine witha driving and stopping mechanism applied thereto embodying the severalfeatures of, the invention in their preferred form; Fig. 2 18 a detailsectional view taken on the line. 22 of Fig. 1; Fig. 8 is a rearelevation of the portion of the sewing machine illustrated in Fig. 1;Fig. 4 is a sectional plan View, partly in elevation, taken on the line4-4 of Fig. 5; Fig. 5 is a sectional view taken on the line 5-5 of Fig.1; Fig. 6 is a sectional plan view taken on the line 66 of Fig. 1; andFig. 7 is a vertical sectional View of the driving and stoppingmechanism taken on the line 77 of Fig. 3.

The present invention is illustrated in the drawings as embodied in alock-stitch outsoleshoe sewing machine such as that illustrated anddescribed in applicants (lo-pending application, Serial No. 382,558,filed May 19, 1920, of which the present application is.

a division. The sewing machine is provided with a main driving shaft 2and a driving shaft 3 which are journaled in hearings in the frame ofthe machine and extend longitudinally and transversely, respectively, ofthe machine. The driving shafts are connected to rotate. in unisonduring the operation of the machine by means of intermeshing spiralgears 4 and 5 secured to the shafts, respectively.

The illustrated driving and stopping mechanism comprises a high speeddriving mechanism and a low speed driving mechanism, the high speeddriving mechanism acting to drive the machine during the. normaloperation thereof and the low speed driving mechanism being thrown inwhen the high speed driving mechanism is thrown out, and beingconstructed to act first to reduce the speed of the machine and then todrive the machine at a low speed. After the low speed driving mechanismhas been in operation at least a predetermined interval, it is thrownout and devices are then rendered active to stop the shaft in apredetermined angular position.

The high speed mechanism comprises a continuously driven pulley 6journaled on a bushing sleeve 17 which is mounted on the main drivingshaft 2 and is interposed between a collar 8 formed on the shaft and aboss 10 on the frame of the machine. The low speed driving mechanismcomprises a spiral gear 12 journaled on a sleeve 14 which is mounted onthe'shaft 2 and held from longitudinal movement between a sleeve 16secured to the shaft and a shoulder 18 formed on the shaft. The spiralgear 12 is held from longitudinal movement by being interposed betweenthe sleeve 16 and a flange 20 formed 011 the rear end of the sleeve 14.The spiral gear 12 is continuously driven by the high speed pulley 6through speed reducing mechanism. This mechanism comprises a worm 22engaging the spiral gear 12 and carried by an inclined shaft 24journaled in bearings on the frame. On the left hand end of the inclinedshaft 24 there is secured a bevelled pinion 26 meshing with a bevel gear28 secured to a shaft 30 jour naled in bearings in the frame. A spurgear 32 is secured to the rear end of the shaft 30 which gear mesheswith a spur gear .34 seplugs being shifted forwardly to bring theirforward ends into engagement with a friction surface on the rear face ofa disk 92 integral with the sleeve 16 which, as hereinbefore described,is secured "to the driv ing shaft 2. The spiral gear '12 then actsthrough the engagement of the friction plugs 90 with the disk 92 and theclutch member 42 to reduce the speed of the shaft to its own speed. 7

After the speed of the shaft has been thus reduced to that of the lowspeed driving mechanism, the brake shoe 64 is released from the clutchmember 42, whereupon the resistance offered by the shaft to being drivenby the low speed mechanism results in the clutch member 42 being drivenby the spiral gear 12 at a greater speed than the shaft which causes thescrew threads 62 to act to shift the clutch member 42 out of engagementwith the friction plugs 90 of the low speed mechanism. After the lowspeed mechanism is thus thrown out, stopping devices are rendered activeto stop the shaft in a predetermined angular position.

In order to insure that the low speed driving mechanism will remaininoperation a predetermined interval at least, means is provided forpreventing the bar 66 from being shifted forwardly to apply the brakeshoe 64 upon releasing the treadle rod 36 until the shaft is insubstantially a pre determined angular position, and forreleasing thebrake shoe 64 at the completion of at least a predetermined number ofdegrees of rotation of the shaft after the brake shoe is applied. Themeans for thus controlling the operation of the brake shoe 64 comprisesa vertically reciprocating carrier 94 mounted to slide in an aperture inthe frame of the machine and actuated bythe engagement of a cam roll 96mounted on its upper end with a cam groove 98 formed in the disk 92, thecam groove being formed to cause the carrier 94 to make onereciprocation during each rotation of the driving shaft. Upon releasingthe treadle rod 36 the bar 66 isprevented from being shifted forwardly asufficient distance to apply the brake until the carrier 94is'substantially at the limit of its upward movement, by the engagementof a roll 102 mounted on the forward end of the bar 66 with the rearside of the carrier 94. As the carrier approaches the limit of itsupward 'movement,the lower end of the carrier passes the roll 102allowing the bar 66 to be shifted by the treadle spring forwardly tocause the lug thereon to engage and straighten the toggle 81 to applythe brake shoe 64. During this movement of the bar 66, the roll 102 iscarried beneath the lower end of the carrier 94. As the high part of thecam groove 98 approaches the cam roll 96 the carrier 94 as it is moveddownwardly engages the roll 102 to swing the bar 66 downwardly to bringan abutment screw 104 threaded through an aperture in the cross piece 68into engagement with a tail piece 106 projecting from the lower arm ofthe brake shoe toggle 81, thereby breaking the toggle to release thebrake shoe from the clutch member 42 to throw out the low speed drivingmechanism as above described. It will be apparent that by adjusting theabutment screw 104, the time of releasing the brake shoe 64 and,consequently, the throwing out of the low speed driving mechanism may bevaried.

The final stopping of the driving shaft 2 is effected after the brakeshoe 64 is re leased to throw out the low speed driving mechanism by theengagement of a stop lug 108 on the disk 92 with a stop dog 110. Thestop dog 110 comprises a blocl: secured to the upper end of a downwardlyspring pressed plunger 112 carried by the carrier 94. The plunger 112comprises a rod having its upper end screw threaded into an aperture inthe stop dog 110 and having its lower portion extending through anaperture 114 in the carrier 94. The plunger rod is urged downwardly bymeans of a spring 116 coiled about the rod and interposed between ashoulder formed near the upper end of the aperture, and a head 118formed on the lower end of the rod. During the normal operation of themachine, the stops 108- and 110 are maintained out of engagement by thecarrier which during its downward movement carries the stopdog 110 downbelow the path of the stop lug 108. Upon the downward movement of thecarrier 94 after the roll 102 is positioned beneath the carrier, thehead of the plunger 118 engages the abutment roll 102 to prevent theplunger from being moved downwardly with the carrier so that the stopdog 110 is held in position to be engaged by the stop lug 108 to stopthe driving shaft 2 of the machine in a predetermined angular position.The stop disk 92 is provided with a notch adjacent the for ward side ofthe stop lug 108, into which notch the stop dog 110 is snapped by theplunger spring 116 upon engagement of the stops, thereby locking thedriving shaft from rotation in either direction.

The stop disk 92 is provided with a slight rise 119 adjacent the stoplug 108, which by engagement with the stop dog110 assists in reducingthe speed of the driving shaft 2 after the low speed driving mechanismis thrown out.

Upon actuating the treadle mechanism to again start th machine, the stopdog 110 is disengaged from the stop lug 108 before the high speeddriving mechanism is thrown in.

This result is accomplished during the first part of the upward movementof the treadle rod 36, the rod acting through the bell crank 38 to shiftthe bar 66 rearwardly to move the roll 102 thereon out of engagementwith the head of the stop plunger 112,. thereby permitting the plungerspring 116 by depressing the plunger 112 to disengage the stop dog fromthe stop lug 108.

The machine illustrated in the drawings is adapted to be manuallyoperated after the machine has been brought to rest by the stopmechanism, and a safety device is provided to obviate any danger of thepower driving mechanism being thrown in While the machine is being thusoperated. Preliminary to the manual operation of the machine, thetreadle rod 36 is raised to release the positive stop dog 110 from thestop lug 108 and to allow the spring 75 to bring the forward end of thebar 66 to the raised position indicated by dotted lines in Fig. 7. Thisresult is accomplished by raising the treadle rod sufficiently todisengage the roll 102 mounted on the bar 66 from the head of the stopplunger 112 without raising the treadle rod sufiiciently to throw in thedriving mechanism. In order to prevent the power drivin-g mechanism frombeing thrown in while the machine is beingmanually operated, means isprovided for securely locking the bar 66 in its raised position andconsequently locking thetreadle rod 36 from movement. This .meanscomprises a locking pinmounted to slide in a bearing in the frame of themachine which pin is advanced, by mechanism hereinafter described, intoengagement with an aperture, 121 in the forward end of the bar 66.

The machine is manually operated by means of a hand wheel 122 mounted toslide on a bearing sleeve 123 secured to the frame.

of the machine and in which the left end of the driving shaft 3 isjournaled. During the normal operation of the'machine the hand wheel isdisconnected from the driving shaft 3 and is held in position against aflange 124 formed on the inner end of the sleeve 123 by the engagementof a spring pressed ball 126 mounted in. the hub of the hand wheel withan annular groove 1.28 in the sleeve 123.. When it is desired to operatethe machine manually, the hand wheel is connected to the driving shaft3pso that upon rotating the hand wheel the main driving shaft 2 of themachine is rotated To connect the hand wheel and the driving shaft 3,the hand wheel is moved outwardly on the bearing sleeve 123 todisconnect the spring pressed 'bal'l 126 from the groove 128 and tobring a hexagonal portion 130 of the inner wall of the hub of the handwheel into engagement with a hexagonal surface 132 'formed on a collarsecured to the extreme left end of the driving shaft 3. The hand wheelis held in this position bythe engagement of the ball 126 with anannular roove .134 in the sleeve 1.13. During the outward movement ofthehand wheel, the locking pin 120 is moved into engagement with thelook ing aperture 121 in the bar 66 by mechanism connecting the handwheel with the bar. This mechanism comprises a rack bar 136 mounted toslide in a bearing in the frame and having its outer end bent at rightangles teen-gage an annular groove 138 in the hub of the hand wheel.This rack bar 136 is pro vided with gear teeth that are engaged by agear segment 14.0 secured to the upper end of a vertical roe-k shaft 142mounted in the frame. The lower end of the rock shaft 142 carries a gearsegment 144 that engages gear teeth formed on a side of the locking pin120.

hen it is desired to again throw in the power driving mechanism of themachine,

the hand wheel 122 is moved inwardly which disconnects the hand wheelfrom the shaft 3 and acts through the mechanism connecting the handwheel with the locking pin 120 to disengage the locking pin from the bar66., thereby releasing the treadle rod to permit the treadle mechanismfor the power driving mechanism to be operated.

The operation of the mechanism illustrated in the drawings has beenindicated in connection with the description of the construction andarrangement of the parts, but may be briefly stated as follows I Asillustrated in Fig.7, the parts are in a position in which the machineis at rest. To throw in the high speed the rod 36 is raised. This forcesthe high speed clutch member 6 against the disk 4.2, thereby rotatingthe disk in a direction to cause the disk to travel along the shaft 2towards the right. Looking from the right of Fig. towards the leitt thedirection of rotation is clockwise. The movementof the disk 42 along theshart 2 is limited by the stop flange 8 on the shaft. The upwardmovement of the rod 36 rocks the bell crank 38 and through the link 66pulls the roll 102 from beneath the plunger 118. The plunger isdepressed by its spring and the stop 110 is removed from the notch 108in the disk 92. hen it is desired to stop the machine the rod '36 isdepressed. The depressing movement of the rod is prevented by theengagement of the roll 102 with the side of the carrier 94, asillustrated in dotted lines in Fig. 7, until the driven shaft 2 and thedisk 92 secured thereto is in a certain angular position. In thisangular position the carrier 94 is raised above the roll 102, therebyallowing the rod '36 to be depressed. the rod '36 moves the high speedclutch memher 6 out of engagement with the disk 42 and at the same timemoves the link 66 be wards the left. The movement of the 11]! towardsthe left causes the cross bar '80 to engage the toggle 81 and therebyforce the brake shoe 64 into engagement the disk 12. This immediatelyputs a drag on the This downward movement of disk 42 so that the shaft 2rotates faster than the disk, thereby causing the disk 42 to be movedalong the shaft 2 towards the left. It is to be noted at this point thatso long as the brake shoe 64 remains in engagement with the disk 42 adrag is exerted upon the disk so that it tends to lag behind the shaft2. The movement of the disk 42 to the left brings it into engagementwith the friction plugs 90 in the lowspeed driving member 12 and pushesthe plugs against the disk 92 which is secured to the shaft 2. Thefriction plugs 90 act as a brake on the disk 92 until the speed of thedisk is reduced to that of the low speed clutch member 12. After thespeed is reduced to this point, the disk 92 on the shaft 2 is driven bythe member 12 of the low speed clutch and continues to be so drivenbecause the brake shoe 64 continues to exert a drag on the disk 42. Theshaft 2 continues to be rotated at the same speed as the low speedclutch member until the carrier 94 is depressed to force down the link66 and thereby break the toggle 81 and remove the brake shoe 64 from thedisk 42.

.As this occurs the rise 119 on the disk 92 engages the stop dog 110 andthereby a braking action is exerted upon the disk 92 which retards therotation of the shaft 2 so that it rotates slower than the member 12 ofthe low speed clutch. The low speed clutch .therefore acts to continuethe rotation of the are not limited to use in any particular type ofmachine.

The nature and scope of the present in vention having been indicated anda machine embodying the several features of the invention in theirpreferred form having been specifically described, what is claimed is gI 1. A driving mechanism having, in com bination, a shaft, a high speeddriving clutch member, a low speed driving clutch member, a drivenclutch member mounted outhe shaft adapted to, cooperate with the drivingclutch mombersand capable of rotary movement relatively to the shaft,and means to. shift the high speed driving clutch member into engagementwith the driven clutch member constructed and arranged to cooperate withthe driven clutch member to connect the high speed driving clutch mem-It is also to be understood ber and the shaft, and upon disengagement ofthe driven clutch member and the high speed driving clutch member toautomatically shift the driven clutch member into enga'gement with thelow speed driving clutch member to connect the low speed driving clutchmember and shaft.

2. A driving mechanism having, in combination, a shaft, a driven clutchmember mounted on the shaft and capable of rotary movement with relationto the shaft, a driving clutch member mounted for rotation about theshaft, and means for shifting the driven clutch member into enga ementwith the driving clutch member, and for thereafter clutching the drivenclutch member to the shaft.

3. A driving mechanism having, in combination, a shaft, a driven clutchmember mounted on the shaft, a friction disk secured to the shaft, adriving clutch member mounted on the shaft having a series of aperturesand interposed between the driven clutch member and the friction disk,friction plugs mounted to slide in said apertures having frictionsurfaces formed on their ends which are adapted to operatively engagejfriction surfaces on the driven clutch member and the friction disk,and means for shifting the driven clutch member into engagement with thefriction plugs to connect the driving clutch member and shaft.

4. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a braking device for reducing thespeed of the shaft after the high speed mechanism and shaft aredisconnected, a low speed driving mechanism for the shaft constructed toact shifting from the high to the low speed driving mechanism and forthereafter disconnecting the shaft from the braking device and lowispeedmechanism.

' 5. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a 10W speed driving mechanismtherefor constructed to act first to reduce the speed of the shaft andthen to drive the shaft at a low speed, and means constructedandarranged for shifting from the high to the low speed drivingmechanism and upon the low speed mechanism acting to drive the shaft forreducing the speed of the shaft below that of the low speed drivingmechanism to disconnect the low speed driving mechanism and shaft.

6. A driving and stopping mechanism having, in combination, a shaft, ahigh speed driving mechanism therefor, a low speed driving mechanismtherefor constructed to act first to reduce the speed of the shaft andthen to drive the shaft at a low speed, means constructed and arrangedfor shifting from the high to the low speed driving mechanism and uponthe low speed mechanism acting to drive the shaft for reducing the speedof the shaft below that of the low speed driving mechanism to disconnectthe low speed driving mechanism and shaft, and means for I angularposition. v.

7. A driving mechanism having, incombination, a driving clutch member, ashaft, a driven clutch member-screw threaded on then stopping'the shaftin a predetermined the shaft and capable of a limited rotary movementwith relation to the shaft whereby the screw threads act to shifttheclutch member longitudinally of the shaft, a stop for limiting thelongitudinal movement of the driven clutch member in one direction,means for shifting the driving clutch member into engagement withthedriven clutch member whereby the driven clutch member tends to beturned in the direction to force it against said stop to establishdriving connection between the shaft and driving clutch memberr 8'. Adriving mechanism having, in combi-V nation, a shaft, a driven clutchmember screw threaded on the shaft and capable of a limited rotarymovement with relation to the shaft whereby the screw threads act toshift the clutch member longitudinally of the shaft, 21 high speeddriving clutch member mounted for rotation about the shaft and'locatedat one side of the driven clutch member, a low speed driving clutchmember vmounted for rotationabout the shaft and located at the oppositeside of the driven clutch member, means for shifting the high speeddriving clutch member into and out of engagement .with the driven clutchmember, means forrreducing the speed of rotation of the drivenclutchmember below that of the shaft when the high speed driving clutchmember and shaft are disconnected, said screw threads constructed toshift the driven clutch member toward the high speed clutch member whenthese clutch members are in engagement, and to shift the driven clutchmember into engagement with the low speed driving clutch member as thespeed of rotation ofthedriveuclutch member is reduced below that of theshaft.

9. A driving and stopping mechanism having, in combination, a shaft, adriving mechanism therefor, means for connecting and disconnecting the"driving mechanism and shaft, and means for stopping the shaft in apredeterminedangular position upon the shaft and driving mechanismbecoming disconnected comprising a braking. device for the shaft, a diskcarried by the shaft, a stop-lug carried by the disk, a cooperating stopdog, and means comprising a cam formed on the disk for maintaining saidating stop dog out of engagement with the stop lug while the shaft anddriving mechanism are connected, and after the driving mechanism: andshaft are disconnected for releasing the braking device and for08ition-ing said stop dog into the path 0 the stoplug.

10 A driving and stopping mechanism having, in combination, a shaft,high and low speed. driving members therefor, means Vforthrowing thehigh speed member into and out of operation, means for throwing the lowspeed member into and out'of eperatien comprising a clutch actuatingmember screw threaded on the shaft and operating when rotated withrelation to the shaft in opposite directions to throw the low speedmember into and out of operation, a brake to retard the rotation of theactuatingmem- ;ber, a stop'disk, a stop dog, timing mechanism to releasesaid brake and applythe stop dog, comprising a timing cam andconnections under the control of theoper- 'ator arranged to insure asubstantial amount of low speed drive. 7

11. A] driving and stopping mechanism having, in combination, a shaft,high and low speed driving members therefor, means for throwing the highspeed member into and out of operation, and means for throw- *and out ofoperation, means for throwing the low speed member into and out ofoperation comprising a clutch actuating member screw threaded on theshaft and operlting when rotated at a less speed than the shaft to throwthe low speed member into operation, and when rotated at a greaterspeed" than the shaft, tothrow the low speed member out of operation,and means for reducing the speed of the actuating member below that ofthe shaft when the high speed member is thrown out.

'13. A. driving and stopping mechanism having, in combination, a shaft,high and low speed driving members therefor, means for throwing the highspeed member into and out of operation, means for throwing the low speedmember into and out of operation comprising a clutch actuating memberscrew threaded on the shaft and oper- 7 when rotated at a less speedthan the shaft to throw the low speed member into operation, and whenrotated at a greater speed than the shaft to throw the low speed memberout of operation, and means for reducing the speed of the actuatingmember below that of the shaft when the high speed member is thrown out,and for reducing the speed of the shaft below that of the actuatingmember after the low speed member has been thrown in at least apredetermined interval.

14. A driving and stopping mechanism having, in combination, a shaft,high and low speed driving members therefor, means for throwing the highspeed member into and out of operation, means for throwing the low speedmember into and out of oper ation comprising a clutch actuating memberscrew threaded on the shaft and operating when rotated at a less speedthan the shaft to throw the low speed member into operation, and whenrotated at a greater speed than the shaft to throw the low speed memberout of operation, means for reducing the speed of the actuating memberbelow that of the shaft when the high speed member is thrown out, andmeans for stopping the shaft in a predetermined angular position afterthe low speed mechanism is thrown out.

15. A driving and stopping mechanism having, in combination, a shaft, adriving mechanism therefor, means for throwing the driving mechanisminto and out of operation, comprising a clutch actuating member screwthreaded on the shaft and operating when rotated with relation to theshaft in opposite directions to throw the driving mechanism into and outof operation, and means cooperating with the actuating member to insurethat the driving mechanism will b thrown in a predetermined interval atleast.

16. A driving and stopping mechanism having, in combination, a shaft, adriving mechanism therefor, means for throwing the driving mechanisminto and out of operation, and means for reducing the speed of the shaftafter the driving mechanism is thrown out, and for stopping the shaft ina predetermined angular position comprising a stop disk, a cam, acarrier reciprocated by the cam, a spring actuated stop dog mounted onthe carrier, and a movable abutment for effecting operative engagementof the stop dog with the stop disk during movement of the carrier in onedirection to stop the shaft in a predetermined angular position.

17. A driving and stopping mechanism having, in combination, a shaft, adriving mechanism therefor, treadle operable means for connecting theshaft and driving mechanism, means for disconnecting the shaft anddriving mechanism, and for maintaining the shaft and driving mechanismdisconnected in such a manner as to permit an independent rotation ofthe shaft, means for preventing the treadle operable means from beingoperated to connect the shaft and driving mechanism while the shaft anddriving mechanism are thus disconnected.

18. A driving and stopping mechanism having,'in combination, a shaft,high and low speed driving mechanisms therefor, treadle operable meansfor connecting the shaft and the high speed driving mechanism, means forshifting from the high to the low speed driving mechanism, fordisconnecting the shaft and low speed driving mechanism, and formaintaining the shaft and low speed driving mechanism disconnected insuch a manner as to permit an independent rotation of the shaft, andmeans for preventing the treadle operable means from being operated toconnect the shaft and high speed driving mechanism while the shaft andlow speed driving mechanism are thus disconnected.

19. A driving and stopping mechanism having, in combination, a shaft, adriving mechanism therefor, treadle operable means for connecting theshaft and driving mechanism, means for disconnecting the shaft anddriving mechanism, and for maintain ing the shaft and driving mechanismdisconnected while permitting independent rotation of the shaft, amanually operable wheel for rotating the shaft normally disconnectedtherefrom and capable of being n'icved longitudinally thereof, means forlocking said wheel to the shaft when the wheel is moved to a definiteposition relatively to the shaft, and connections between said wheel andtreadle operable means for locking the treadle operable means from beingoperated to connect the shaft and driving mechanism while the wheel islocked to the shaft.

20. A driving and stopping mechanism, having, in combination, a shaft, amanually operable wheel normally disconnected from the shaft, a powerdriving mechanism for the shaft, and means to simultaneously lock thepower driving mechanism out of operation and for connecting the shaftand manually operable wheel to permit the wheel to be operated to rotatethe shaft independently of the driving mechanism.

21. A driving and stopping mechanism having, in combination, a shaft,high and low speed driving mechanisms therefor, means for shifting fromthe high to the low speed driving mechanism, a manually operable wheelnormally disconnected from the shaft, and means for connecting the wheeland shaft.- and for maintaining the low speed driving mechanism andshaftdisconnected to permit the shaft to be rotated independently of the lowspeed driving mechanism.

FRED ASI-UVORTH.

